Conditional Handover for Network Energy Saving in 5G
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Solution Overview
Problem
In 5G mobile communication systems, when a base station transitions to a state where data is not transmitted or received, and a large number of user equipment (UE) are concentrated in a specific cell, collisions and overload may occur due to unmanaged connection operations.
Innovation Solution
A method where user equipment (UE) in a wireless communication system receives a radio resource control (RRC) message from a base station containing a configuration for conditional handover (CHO), and performs the handover if a specified event, such as network energy saving (NES) conditions, is satisfied, thereby balancing the load across target cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If user equipment concentrates in a specific cell when base station transitions to energy saving state, then network energy saving is achieved, but collision and overload occur due to unmanaged connection operations
Solution Approach 1:
The patent applies preliminary action by configuring conditional handover (CHO) parameters in advance before the base station transitions to energy saving state. The UE receives RRC messages containing CHO configurations including target cell information and execution conditions, preparing the handover mechanism beforehand. When the energy saving state is activated and overload occurs, the pre-configured CHO can be executed immediately without requiring real-time signaling, thus preventing connection failures while enabling energy saving.
2Reliability
If manual handover management is implemented to prevent collision and overload, then connection reliability is improved, but network energy consumption increases due to additional signaling and control operations
Solution Approach 1:
The patent implements self-service through autonomous conditional handover execution at the UE side. The UE autonomously evaluates handover conditions based on pre-configured parameters and executes handover decisions without continuous network control. The network only needs to provide initial CHO configuration and trigger energy saving state, after which the UE independently manages its own handover, eliminating the need for continuous signaling and reducing network energy consumption while maintaining connection reliability.
3Reliability
If conditional handover configuration is provided to user equipment, then handover execution reliability is improved, but device complexity increases due to additional configuration management
Solution Approach 1:
The patent applies segmentation by dividing handover management into distinct phases: configuration phase (network provides CHO parameters via RRC messages) and execution phase (UE autonomously evaluates conditions and executes handover). The configuration is segmented into specific elements including target cell identifiers, execution conditions, and timing parameters. This structured segmentation simplifies the overall complexity by organizing configuration management into manageable, well-defined components that the UE can process systematically.
Data Source
AI summary
The present disclosure relates to 5G or 6G communication systems to support higher data transmission rates. The present disclosure a method and apparatus of a UE. The method of the UE comprises: receiving, from a base station, a radio resource control (RRC) message including configuration information associated with a conditional handover (CHO); determining, based on the configuration information, whether an event is satisfied; and performing the CHO based on a determination that the event is satisfied.